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Where is the "Water" of Mars? (Polar Regions)
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Water abundances in the Martian Polar Regions, from the Neutron Spectrometer on Mars Odyssey, are shown here to complement the Mercator Projections of Equatorial Regions.
The North Pole is nearly pure water ice, while the South Pole is water iced mixed with other stuff, most likely dry ice (CO2) and mineral dust.
More details are available in the Los Alamos National Lab press release.
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